How to run RStudio Playwright tests in Desktop and Server modes. Use this skill whenever the user asks to run, execute, or launch Playwright tests against RStudio - whether on Desktop (local) or Server (remote). Also use when the user asks about the test command, environment variables, or how to point tests at a server URL. Trigger on phrases like "run the test", "execute on server", "run it on desktop", "run against <IP>", or any request involving npx playwright test for the RStudio test suite.